Last-block-centering machine



Dec. 14, 1926. I 1,610.597 C. BLACK LAST.BLOCK CENTERING ACHINE FiledMay 23. 1924 3 Sheets-Sheet 1 Dec. 14 1926.

' C. BLACK LAST BLOCK CENTERING momma 3 Sheets-Sheet 2 Filed May 25,1924 Fig.4.,

Dec. 14, 1926. 1,610,597

' C. BLACK LAST BLOCK CENTERING MACHINE Fi1ed May 23. 1924 3Sheets-Sheet 5 v,

Fig. 3.

INVENTUR.

' Mmx a machine for centering last blocks, though Patented Dec. 14:,1926.

UNITE STATES 1,610,597 FFICE.

ATE?

CARL BLACK, OF ALFELD-O I T-THE-LEINE, GERMANY, ASSIGNOR TO UNITED SHOEMA- CHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

LAST BLOCK-CENTE RING DIACHINE.

Application filed May 23, 1924,8eria1 No. 715,427, and in Germany May24, 1923.

This invention relates to work centering machlnes, and is disclosed inconnection with the invention is equally applicable to the centering ofwork pieces generally which are to be treated in a copying lathe.

In a copying lathe, a work piece is cut by in the machine, and, ingeneral, the dimensions of the work piece will be different from thoseof the model, being pantographically magnified or reduced by theso-called grading mechanism. It is thus diilicult for the machineoperator to predict accu rately just where the surface of the finishedwork piece will run, and it often happens that his judgment in placingthe rough block in the machine is an error, so. that there isinsufficient material on the rough block in some places, which spoilsthat work piece; so that there is an undue surplus of material inplaces, which results in obtaining a smaller finished piece than couldhave been got out of that rough block. It has long been regarded asdesirable to mark the ends of the work pieces with centers or dog marksupon which they may be hung in the copying lathe in order that thequestion of getting the desired finished work piece out of the roughblock may not be left solely to the hasty judgment of the machineoperator; and in order to obtain the best results under conditions ofpantographic grading, it is necessary that the centers or dogmarks shallbe so placed in the work piece as to define a rotation-axis having thesame geometrical relation to the work piece as the corresponding axis ofrotation has in the model.

For example, suppose that the model last is of such shape that therotation-axis, or line joining the dog marks, is twice as far from theoutside lateral edge of the forepart as it is from the inside lateraledge. Then,

in order to cut lasts from this model in the A similar statement for acopying lathe in the same geometrical or proportional relatlon to theexternal sur face of the work piece as the corresponding a means forlocating a copying lathe work reference to a model which is also carrledpiece relatively to a marking means or dog in directions perpendicularto the axis of rotation that it is to have in the copying lathe, in suchmanner that the marking means shall mark the work piece in the samegeometrical relation to its surface irrespective of its dimensions. Thisgeometrical-relation of course must be-variable at will in order tocorrespond withthe particular model used. Somewhat more broadly stated,the invention provides means for dividing a dimension of an object inany desired proportion comprising feelers and a cooperating marking dog.In the disclosed machine the locating means takes the form of two pairsof feelers or locating members, those of each pairmoving in oppositedirections at different (and relatively ad ustable) speeds, andthose ofone palr moving 1n directions which are perpendicular to the directionsof movement of the other pair. The feelers of each pair meet each otherat a point which registers with the desired rotation-axis as located bymarking dogs, and there is provided a connection between the relativespeed adjustments and the marking dog adjustments which maintains thisrelation at all times, independently in the two perpendiculardirections. Thus the rotation-axis is located in the proper geometricalrelations to the surface measured both horizontally and vertically,which is'the result desired.

These and other features of the invention comprising certaincombinations and arrangements of'parts will be understood from thefollowing description of a preferred embodiment thereof selected forpurposes of illustration and shown in the accompanyingdrawings in which,

Fig. 1 is a diagram illustrating the theory and operation of thelocating means;

Fig. 2 is a front elevation of a machine embodying the principlesbrought out in Fig. 1;

and

Fig. 4 1s a plan view.

Fig. 3 is a side elevation of the machine,

Referring first to Fig. 1, the two horizontal guides have mountedbetween them the slide blocks 12, which are threaded to a right and leftscrew 14:, operable by a handle 15, by means of which they can be movedtoward and from one another at equal speeds so as to be always at equaldistances from the center line lit-ll of the system. Similarly pivotedat points 16 to the blocks are bell-crank levers 18, 20 in the arms ofwhich are formed slots 22, 24-, the longitudinal axes of which aresubstantially at right angles. A. pin 26 passes through the twohorizontal slots 22 and is carried on a bar 28 slidably mounted inguides 30, 32, and pulled upwardly by a spring 34. A pin 36, passingthrough a hole in the bar 28, is ranged to hold the pin 26 in the linejoining the centers .6 so that the slots 22 extend in the same straightline.

The guides 30, 32 are adjustable together to the right and left in 1 toadjust the pin 26 back and for h in the slots 22 when in such collinearacjustment, thus effecting such adjustment of the pin without causingany movement of the bell-cranks 18, 20.

The slots 24: in the upper ends of the bellcranks each embraces a pin 35on a rod 37 guided for movementeto the ri ht or lett, as seen in Fig. 1,in guides 88. Each rod carries a feeler 40. A pointer 42 is slidablymounted on a rod for movement parallel to that of the rods 3. Thepointer 42 and the guides 30, 32 are supposed to be so in terconnectedthat when the pointer is moved a distance 02 to one side of the centerline ll'lM, the pin 26 will be moved an equal distance 00 to the otherside of the line. Means for actually accomplishing this result will bedescribed later.

The manner of using the device is as tollows :'lhe pin 36 is placed inposition as shown in Fig. 1, and the model in relation to which the workpieces are to be marked or centered is placed between the feelers l0.The screw 1 is then operated until the feelers 1-0 contact with thesides of the mod 1. The vertical arms oi the hell-cranks will remainvertical during this adjustment of the blocks 12, the slots sliding onthe pin 26. The pointer is then moved laterally unt l it registers withthe dog marks which indicate the axis of rotation in the model, say tothe point a, and the pin 28'will thereby be moved the same distance inthe opposite direction from the line liL M. The pin 36 is now removed,and the spring 3 1 will sepz rate the feelers by lifting the pin and theslots 22.

Suppose now that a vorl: piece of gener ally similar form to the modelis placed between the feelers 40 and the bar 28 pulled down as byatreadle l6 until the feelers contact with the work piece. It the workpiece be smaller than the model, the bell-cranks will be tiltel by thedescending pin 26 into he dotte line positions shown in Fig. 1, and tthe work piece be large than the model he cranks will move only to thedot-andlash line position shown in Fig. 1. The work piece is then markedas indicated by the pointer .2-2 at a.

i l e have now to erami iet position of the marl; at a to the work niecedimension (Zc between the feelers, as corn pared with the relation ofthe position of the point r at a, wi h the corresponding dimension Z20ot the iiod l. Denote the or nal position oi the pi; 26 by the tinal poby g, and the positions ot the pivots lo 1 and respectively, as shown inFig. 1. Then, having regarc. to the conditions oi tl criginal adjustmentof the machine to l model;

(it) we =f7t; 070 of c0 cj J 7 whence 5 l Lil i) c piece can be d videdi i t o as Ziiti correspond; dimens The machine shown in h des ior suchdim-non or he work piece taken at r ht an les to each other whereby theaxi of rotat on defined by the dog inarl'i at th ends of piece can belocated in the goon position in the work piece as it occu ied in themodel from which the machine \"as set.

The guides 16,

20, pin L I -l v. I rrncteli essen- 1-: 7i 1 snow lee Kerrie-u. aims L..2ell-cranl:s are constructed in biiur- J. 1 n) 1 7 1." (.1. cate lolinLO stir-tern ie Jlocns in (.s lone 1 4: .1 U i J: i. '31"! in his. -21ier LnC e; or greater siinne;-.s, ron ES substantially as described inconnection with F] l. The rods 37 instead of being guided in slidebearings are hung upon a parallel link mechanism cons sting'ot the ups.rdly extendmg arms 18, 20 ot the bell-cranks and parallel links 48 bywhich the outside ends of the rods 37 are connected to the blocks 12,but their operation is substantially the same as before described. Therods 37 carry feelers 40 substantially as shown in Fig. 1. 1

Arranged at the side of the machine, as shown in Fig. 2, are verticallyextending guides 1O upon which is mounted mechanism of exactly the sametype working in exactly the same way and terminating in feelers 40 allof the members of this mechanism having numbers corresponding to those 1of the mechanism first described but with the additional index a.

The marking dogs 00, 52 are located on vertically adjustable slidingstandards the height of which is regulated by screws 54, 56 which areoperated by a handle'58 and bevel gearing 60, 62 on a shaft 63. Thescrews 54, 56 have the same pitch and the two dogs 50, 52 are alwayskept at the same height. A bevel gear 64 on the shaft 63 through atelescoping connection 66 actuates a bevel gear 68 which operates ascrew 70 which carries the slide 30 and moves the pin 26 vertically inthe opposite direction and to the same eX- tent as the vertical movementof the dogs 50, 52.

The marking dogs are also horizontally adjustable upon guides 72, beingmoved by like screws 74, upon these guides, the screws being connectedto the shaft 76 by bevel gears 7 8, 80, and the shaft being oper ated bya handle 82. The screw 74: by sprocket gearing 84 is connected to theshaft 86 which is threaded and arranged to carry back and forward theguides 30 and 32 upon which the pin 26 is mounted, the gearing beingsuch as to move the pin 26 in the opposite direction to the horizontalmovement of the dogs 50, 52 but by the same amount at all times, asdescribed above in connection with Fig. 1. There is also provided a V-shaped resilient fork 88 for centering the rear part of the last block,as there is always sufficient wood in that part of the last block andany proportional adjustment is unnecessary there.

The use of the machine is as follows: The two pins 36, 36 are placed inposition so as to center the slots engaged by the pins 26, 26 The modelis then placed between the feelers 40, 4.0 and the screws 14, 14 areoperated to carry the blocks 12, 12 toward each other, respectively,until the two sets of feelers grasp the model between them. The feelersin this instance of the invention are arranged to grasp the forepartofthe last and last block, the heel being taken care of by the fork 88.The handle 82 is then 0perated to carry the dogs 50, 52 into horizontalregistration with the ends of the model which may have been alreadymarked by dogs. At the same time, this adjustment of the dogs carriesthe pin 26 in the opposite direction and by the same amount relativelyto the center line MM. The handle 58 is then operated to raise the dogsinto vertical registration with the ends of the model and this operationalso adjusts the pin26 in the opposite direction and in the same amountrelatively to the center line mm. The machine being thus set for themodel, the pins 36, 36 are removed whereupon the springs 34:, 34 operateand spread the feelers apart to their fullest eXten The block to bemarked is set in the machine with its heel on the fork 88 and itsforepart between the four feelers 40, 40 The rods 28, 28 are then drawnout by any suitable mechanism such as the treadle 46 shown in Fig. 1,and the two sets of feelers move the block horizontally and verticallyso that the dogs have the same geometrical relation to it that they hadto the model in the adjustn'ient of the machine. In other words, if thevertical distance between the feelers 40 was divided in a certain ratioin the case of the model that vertical distance when the feelers 40 aregrasping the block will be divided in the same ratio. A similarstatement is true of the horizontal distance of the feelers 40, but theratio in that case need not be the same as that appertaining to thevertical distance.

The dogs may then be driven into the block, while thus held, in anydesired manner.

' Thus the rotation-axis defined by the dog marks in the block islocated in the same geometrical horizontal and vertical relations tothat portion of the block embraced by the feelers as exist between themodel rotationaXis and the model. If, therefore, a last block somarkedbe placed in the copying lathe with the model used in setting the blockmarking machine, and if the width grading mechanism be setto get themaxi mum possible last ontof the block, there will be about the samesurplus of material to be removed all around the block, and undue wasteis avoided. of attempting to get too large a last out of the block, andthereby running out of its surface somewhere, is minimized.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States is '1. In a machine of the classdescribed, block marking means and means for holding and presenting ablock to the marking means with a desired cross-section of the block ina predetermined geometric relation to the marking means, irrespective ofthe dimensions of the block.

2. In a machine of the class described, block marking means and meansfor holding and presenting a block to the marking means to divide twomutually perpendicular dimensions of a selected cross-section of theblock in predetermined ratios, respec- At the same time the risk tively,irrespective of the dimensions of the block.

3. In a machine of the class described, last block marking meansarranged to indent the ends of a last block to establish an axis of roat-ion for the lock in the last lathe, and means for moving the blockrelatively transversely to the marking means to locate the said axis ofrotation in predetermined geometrical relations, measured according tothe vertical and lateral dimensions of a selected cross-section of theblock, respectively, irrespective of the absolute size of the block.

t. In a machine of the class described, block marking means, a pair offeelers arranged to locate a block relatively to the marking means,members for moving the feelers, and operating means for moving themembers, there being an adjustable connection between the operatingmeans and the members to regulate the relative speeds of the feelers inapproaching the block.

5. In a machine of the class described,

, last block marking means, a pair of feelers arranged to grasp a lastblock between them, a pair of levers, one arm of each of which operatesa said feeler, and operating means connected to the other arms of thelevers, the relative effective lengths of the being adjustable to varythe movementratio of the feelers.

6. In a machine of the class described, last block marking),- means, apair of feelers arranged to grasp a last block between them, a pair oflevers, one arm of each of which operates a said feeler, and operatingmeans connected to the other arms of the levers, the point ofapplication of the operating; means being adjustable to vary therelative throw of the levers.

7. A work positioning means comprising a block marking; means andmembers arranged to be moved in opposite directions at a velocity ratiowhich is constant during any operation of the machine, but which is adjnstable at will, and to grasp an article at the extremities of adimension thereof, whereby articles differing in said dimension may bepositioned with a point geometricall v related to the dimension inregistration with the block marking means.

8. In a machine of the class described, a marking means, a pair offeelers constructed and arranged to be moved in opposite directions tograsp a work piece and hold it with reference to the marking means, themarki115) means beii adjustable parallel. to the anged to be ions tograsp a work piece and hold it with reference to the marl-1mg means, the

-l ans being ad ustable parallel to ot movement of the feelers,

b an operating i'neans having an adjustable connection with the levers,constructed and j to cause the feelers to meet each n registration viththe marking irrespective of its adjustment. n machine of the classdescribed, a n k means, a pair f feelers, means for moving; them inopnosite directions to grasp niece and hold it with reference to means,the marking means heible parallel to the direction of f feelers, leverscarrying the tee 1 an operating means having an :e connection with thelevers, there mechanical connection between the means adjustment and theoperatns adjustment constructed and arto cause the feelers to meet eachremstration with the marking ective of its adjnstn'ient.

1i. 'achine of the class described, a tool, a pair of feelers arrangedto grasp a work niece between them and hold it with refci nce to thetool, a lever for operating each fecler, and ntieans for varying therelative mechanical advantasres of the levers to adjust the geometricalrelation between the tool. and the work piece when in operativeposition.

In testimony whereof I have signed my name to this specification.

Hit) U. 115

CARL LACK.

Certificate of Correction.

Patent No. 1,610,597. Granted December 14, 1926, to CARL BLACK.

It is hereby certified that error appears in the printed specificationof the abovenumbered .patent requiring correction as follows: Page 2,after line 95, for the statement and that the said Letters Patent shouldbe read With this correction therein that the same may conform to therecord of the case in the Patent Oflice.

Signed and sealed this 23d day of August, A. D. 1927.

[SEALl M. J. MOORE,

Acting Uo'rmm'ssiower of Patents.

